Крижанівський, Є. І. “Scientific and Organizational Principles of Increasing of Extraction of Domestic Oil and Gas and Diversification of Energy Resources Supply for Improving Energy Security of Ukraine”. Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas (Series: Economics and Management in the Oil and Gas Industry) 2, no. 12 (September 1, 2015): 7–14. Accessed November 23, 2024. https://eung.nung.edu.ua/index.php/ecom/article/view/109.